My API-Key is not working, what’s wrong?

• You’re API-Key is invalid. Please contact our support via email [e-mail].
• Your trial limit has exceeded 10.000 API requests in the actual month or your API call quota has exceeded his limit (HTTP 429 – Too many requests, Limit exceeded).
• Something with your payment processing might go wrong and your API-Key is temporarily deactivated. Please contact our support via email [e-mail]!